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The radon detector aboard the RV Investigator is a 700 L dual-flow-loop two-filter radon detector. The instrument has a response time of 45 minutes which can be completely corrected for in post-processing.
As an unambiguous tracer of terrestrial influence on air mass composition, radon is an essential component of baseline studies for: selection of least terrestrially perturbed marine air masses; tracing and analysis of air mass history and fetch; calibration / constraint of regionally-integrated emission estimates for important distributed trace gases; and evaluation of transport and mixing schemes in climate and chemical transport models. See http://www.ansto.gov.au/ResearchHub/OurResearch/environmentresearch/Research/IsotopesinClimate/AtmosphericMixing/index.htm.